问centos 7 x64 源问题 怎么配置？

#yum -y install wege screenLoaded plugins: fastestmirror, langpackshttp://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: Errno 14 curl#6 - "Could not resolve host: mirrors.tencentyun.com; No address associated with hostname"Trying other mirror. One of the configured repositories failed (EPEL for redhat/centos 7 - x86_64), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable epel 4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=epel.skip_if_unavailable=truefailure: repodata/repomd.xml from epel: Errno 256 No more mirrors to try.http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: Errno 14 curl#6 - "Could not resolve host: mirrors.tencentyun.com; No address associated with hostname"root@VM_22_102_centos ~# yum -y install weget screenLoaded plugins: fastestmirror, langpackshttp://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: Errno 14 curl#6 - "Could not resolve host: mirrors.tencentyun.com; No address associated with hostname"Trying other mirror. One of the configured repositories failed (EPEL for redhat/centos 7 - x86_64), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable epel 4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=epel.skip_if_unavailable=truefailure: repodata/repomd.xml from epel: Errno 256 No more mirrors to try.http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: Errno 14 curl#6 - "Could not resolve host: mirrors.tencentyun.com; No address associated with hostname"不管干什么都是这个错！